The most common and most likely answer to this crossword clue is the 9 letter word WARMONGER
I've seen this crossword clue in The Guardian
W
A
R
M
O
N
G
E
R
More clues leading to the result WARMONGER
- Hawk in range, worm agitated
- Hawk with 2 fractures around wing
- Militarist marines ahead in punt
- Duck under branch gripped by bird, not one for hawk
- Mild joke about German king’s hawk
- Aggressor getting close to target over Gulf
- Militant type working to be accepted by friendly German
- Fighting force getting forward into hazard — I wouldn’t mind that?
- Scrap-merchant?
- Bet about magistrate taking on belligerent person
Buddy explains!

The straight part
We know that "Offensive type" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case offensive type = warmonger.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does WARMONGER mean?
WARMONGER noun- Someone who advocates war; a militarist.
- To advocate war.